An ambulance waits for a British man at an airport in Toulouse after he suffered a medical emergency on a flight to Ibiza

Minutes before the tourist began "shaking" in his seat, witnesses claim he had poured a white substance into a vodka and coke before knocking it back in front of the cabin crew.

One witness said: “He had gone to the loo several times and was acting very strangely.

“People sitting around them said they were definitely on drugs and when the attendants closed the toilets to stop them he poured everything he had left into his drink.

One witness, who does not want to be named, told The Sun Online how the Brit began “shaking” in his seat before crew rushed to the front of the plane with an oxygen mask and a heart-shocking defibrillator.

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The witness said the man who was rushed to hospital before being pronounced dead, was travelling with a girl who appeared “distressed” and was being comforted by older passengers during the mid-air ordeal.

She said the flight was delayed nearly five hours as customers waited for another plane to be flown in from Manchester.

The rest of the passengers eventually arrived in Ibiza at 1.30am this morning.

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